Połączenie dwóch różnych technik pomiarowych, georadaru i magnetometrii, dało archeologom przełomowe narzędzie do rozwiązywania zagadek z przeszłości.

Combining two different surveying methods – ground-penetrating radars and magnetometry – using the Amplitude Data Comparison method (ADCM) offers archeologists a new, cutting-edge tool to unravel the mysteries of the past.

We talk with Prof. Witold Rużyłło, MD, PhD, a pioneer of advanced cardiological techiques in Poland, about ongoing progress in interventional cardiology, creating a system for early identification of those at risk of heart disease, and the role of prevention.

Back in the 1960s, as a 21-year-old, he managed the first gigantic computer in Poland. Now the young people he gives win prizes in prestigious programming contests. We talk with Prof. Jan Madey about the history and future of computer science.

The paper presents results of a study on the effect of passage of time on magnesium content in iron alloys and the effect of magnesium content on the number of vermicular graphite precipitations per unit surface area and value of the longitudinal ultrasonic wave velocity for two different vermicularization methods. The study was carried out with the use of inspection bar castings. For specific production conditions, it has been found that in case of application of both the cored wire injection method and the method of pouring liquid metal over magnesium master alloy on ladle bottom, the satisfactory level of magnesium content in the bottom-pour ladle, for which it was still possible to obtain castings with vermicular graphite, was 0.018% Mg. In case of the cored wire injection method, the “time window” available to a pouring station at which castings of vermicular cast iron are expected to be obtained, was about 5 minutes. This corresponds to the longitudinal ultrasonic wave velocity values exceeding 5500 m/s and the number of graphite precipitations per unit surface area above 320 mm–2. In case of the master alloy method, the respective “time window” allowing to obtain castings of vermicular cast iron was only about 3 minutes long. This corresponds to the longitudinal ultrasonic wave velocity value above 5400 m/s and the number of graphite precipitations per unit surface area above 380 mm–2.